How do I know what version of Outlook I have installed? Carolyn Chassaigne December 20, 2017 08:16 Updated In Outlook, go to File > Help. Version may also be listed under Help > About Outlook If you want more information on your Outlook version, head here. Related articles How do I install Yesware for O365? What versions of Outlook does Yesware support? Re-enabling a disabled add-in for Outlook 2016 Why isn't the Yesware Sidebar showing in Outlook? How do I reinstall Yesware for Outlook?